Galileo was a very smart man. In Europe back in his day, people only knew what the Catholic Church told them, and the Catholic Church only believed what was said by the Greek Philosopher, Aristotle. If you didn't agree with either the Church or with Aristotle, you were called a Heretic, since you were disagreeing with the Church, the Bible, and ultimately, God. Galileo was one of the few Astronomers to disagree with Aristotle, and probably the only one who got off near scot free.
Moon Observations
The first thing that Galileo did once he had invented a supercharged (at the time) telescope was to point it at the moon. Believe it or not, this was also the first way he majorly disproved the Church and Aristotle! Thousands of years ago Aristotle famously said that "Every heavenly body is Perfect and without flaws." but one thing that Galileo discovered, as shown here, is that the moon is COVERED in hundreds of small craters caused by impacts from meteors. Not exactly Perfect, is it?
Jupiter and its Moons
Another thing Aristotle said that the church also believed in a little too much was that supposedly, all the Heavenly Bodies are surrounded by giant glass spheres inside other giant glass spheres spinning around each other. However, when Galileo was scanning the skies with his grand telescope, he noticed a bunch of small "stars" surrounding Jupiter. However, when he pointed his telescope at Jupiter a few days later, he noticed that they had moved! He took notes, and deduced that every few days, the
Moon Observations
The first thing that Galileo did once he had invented a supercharged (at the time) telescope was to point it at the moon. Believe it or not, this was also the first way he majorly disproved the Church and Aristotle! Thousands of years ago Aristotle famously said that "Every heavenly body is Perfect and without flaws." but one thing that Galileo discovered, as shown here, is that the moon is COVERED in hundreds of small craters caused by impacts from meteors. Not exactly Perfect, is it?
Jupiter and its Moons
Another thing Aristotle said that the church also believed in a little too much was that supposedly, all the Heavenly Bodies are surrounded by giant glass spheres inside other giant glass spheres spinning around each other. However, when Galileo was scanning the skies with his grand telescope, he noticed a bunch of small "stars" surrounding Jupiter. However, when he pointed his telescope at Jupiter a few days later, he noticed that they had moved! He took notes, and deduced that every few days, the
Saturns Rings
Sunspots on the Sun
Venus has Phases